Case study:Brackenhurst Natural Flood Management

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Location: 53° 3' 53", -0° 58' 4"
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Project overview

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Status In progress
Project web site http://www.therrc.co.uk/sites/default/files/projects/25_brackenhurst.pdf
Themes Flood risk management, Habitat and biodiversity, Land use management - agriculture, Land use management - forestry, Monitoring
Country England
Main contact forename Andy
Main contact surname Disney
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk/government/organisations/environment-agency
Partner organisations Nottingham Trent University, Trent Rivers Trust, Southwell Flood Forum, Nottinghamshire County Council
Parent multi-site project
This is a parent project
encompassing the following
projects
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Project summary

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This project is a PhD research project being conducted at Nottingham Trent University by Josh Wells, supervised by Dr Jillian Labadz (Nottingham Trent University) and advised by Andy Disney (Environment Agency) and Professor Colin Thorne (University of Nottingham). It was developed on Nottingham Trent University's Brackenhurst Campus following a summer 2013 extreme flood event in the catchment, which affected the nearby market town of Southwell, immediately downstream (Map 1). A total of 107.6mm of rain fell within a 2-hour period and resulted in the flooding of up to 300 homes. The aim is to aims assess the extent to which Natural Flood Management (NFM) can help to reduce future fluvial flood occurrence in Southwell. A NFM scheme was developed for the Potwell Dyke catchment (Southwell, Nottinghamshire) as part of the PhD project. In summer 2016, 10 large woody debris dams were installed within the streams. In autumn 2016, a river restoration programme was implemented with the excavation of original meandering stream morphology along a reach plus the provision of some additional online storage capacity and the construction of 5 earth bunds in field corners. These interventions are designed to store and slow water while promoting ecological gains. A network of hydrological monitoring was installed to enable pre and post intervention stage (water level) and rainfall data to be compared. Around a year's worth of pre-intervention stage data have been collected at most locations, with one site being monitored for 2.5 years. The catchment for the Potwell Dyke is around 6km2. The NFM interventions by Nottingham Trent University are in 2 subcatchments: Springfield Dumble and Parklane Close Dumble. To date, an estimated 3,000m3 of storage has been created within these subcatchments. There is an intention to roll out further NFM measures on multiple land holdings within the Potwell Dyke catchment. Work is being carried out by Trent Rivers Trust to liaise with local landowners, with funding obtained from the Regional Flood and Coastal Committee.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment



Site

Name Potwell Dyke
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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Average bankfull channel depth (m)
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Project background

Reach length directly affected (m)
Project started 2016
Works started
Works completed
Project completed
Total cost category
Total cost (k€) £100k
"£" is not declared as a valid unit of measurement for this property.
Benefit to cost ratio
Funding sources Environment Agency, Local levy funding, Vice-Chancellor Scholarship, Nottingham Trent University

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Flood risk management
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor establishment of woodland
Planform / Channel pattern
Other Runoff pathway management
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

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Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
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Monitoring documents



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Supplementary Information

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